Abstract: A noise is generated unavoidably owing to hunting phenomenon that appears in process of increasing or decreasing torque to be transmitted by a hydraulic coupling in a hitherto known type, when it is subjected to change of the ambient temperature.A purpose of this invention is to provide a new and unique hydraulic coupling which enables hydraulic connection to be effected very quickly in such a way that engagement or disengagement between ferrite and magnet is applied to transfer mechanism in hydraulic coupling, depending on the ambient temperature.The above purpose of the invetion has been accomplished as follows.Magnetical attractive force between ferrite and magnet is predetermined to overcome spring force in a normal temperature, and working temperature for this new mechanism according to the invention is selected around at Curie temperature of said ferrite material.

Abstract: The specification discloses a clutch assembly made up of a sleeve and a hub supported on each other for free rotation and being suitable for connecting a drive member to a driven member. The hub and sleeve have friction discs attached to them and the friction discs engage a pressure ring. A supply of oil under pressure is connected to the cavity that receives the clutch plate and when oil is admitted to the friction ring cavity it first fills this cavity then spills over into a cavity containing an actuating piston connected to the pressure ring where the oil forces the actuating piston together with the pressure ring into engagement with the clutch plates thereby forcing them into frictional engagement with each other. A reaction force against the clutch plate is provided by a pressure and adjusting ring from which a reaction force is transmitted to the clutch plate through a Belleville spring. By means of the adjusting ring, the pressure at which the clutch plates will slip can be adjusted.

Abstract: A shear liquid fan drive assembly for radiator cooling system of an internal combustion engine of the type wherein a temperature responsive valve controls the degree of rotary coupling between the engine and a radiator cooling fan by controlling the quantity of shear liquid between a driving disc and a driven housing carrying the fan. The specific improvement relates to a modification for redirecting flow of shear liquid to inhibit breakdown of the shear liquid due to overheating.

Abstract: A rotating fluid shear friction coupling with at least one shear friction gap formed by a wall rotating along with the input side and by a wall rotating along with the output side, and with two spaces in communication with the working gap, one on the inlet side and one on the outlet side; the radially outermost passage of the inlet side space into the working gap has radially a larger spacing from the center of rotation than the radially outermost passage from the outlet side space whereby the two spaces are separated from one another by a wall provided with controllable passages; the working gap is also provided with means, for example, in the form of a helical feed groove for the continuous automatic feed of the working medium through the working gap in the direction toward the space on the outlet side; the space on the outlet side has thereby a space portion which is delimited radially outwardly by walls that preferably rotate with one another as a unit, and is disposed radially outwardly of the radius of

Abstract: A viscous fluid clutch wherein a fluid medium functions in response to ambient temperature changes to transmit torque between relatively rotatable input and output members by variably filling a predetermined shear space therebetween with a viscous fluid medium, the shear space consisting of interdigitated concentric annular grooves formed on adjacent faces of the input and output members, each groove being approximately 0.060 inch wide and 0.270 inch deep, with the lands separating adjacent grooves being approximately 0.040 inch wide, and the fluid medium used in conjunction therewith having a viscosity of approximately 3,000 centistokes, the combination producing improved results with respect to inhibiting boiling of the radiator coolant and prolonging fluid medium operational life.

Abstract: A variable speed fan for heat exchangers comprising a variable speed torque transmitting coupling interposed between a constant speed drive shaft and a fan for varying the speed of the fan in an air cooled heat exchanger having a constant speed drive for input torque. Torque is applied at a constant speed from the drive shaft of a suitable power source to a pump disposed in a fluid reservoir contained in a housing supported on the drive shaft. The reservoir housing is journalled on the drive shaft and rotatably supports the fan thereon. The pump is rigidly secured to the reservoir housing and as the rotor of the pump is rotated by the drive shaft, fluid is pulled into the pump and discharged therefrom through a suitable variable orifice valve for being recirculated to the fluid reservoir.

Abstract: A temperature controlled fluid shear coupling adapted to drive a fan for an internal combustion engine. The coupling includes a driven member defining a housing adapted to carry the fan, a drive member adapted to be driven by the engine, a working chamber defined by the driven and drive member and containing viscous fluid, a pump for removing fluid from the working chamber to a reservoir, and temperature control assembly which varies the volume of fluid in the working chamber by controlling fluid flow from the reservoir to the working chamber in response to temperature changes. The temperature control includes a wax filled power element and a valving member. The valving member blocks fluid flow from the reservoir to the working chamber when the wax is solid and allows flow to the working chamber when the wax is a liquid.

Abstract: A fluid coupling for driving a cooling fan associated with a vehicle in a ram air stream. The coupling comprises relatively rotatable input and output members. The output member defines a chamber within which the input member rotates. The members have lands and grooves which define a shear space therebetween, and are cooperable with viscous shear fluid to transmit torque therebetween. The output member defines a reservoir chamber located forwardly of the lands and grooves in the ram air stream. An impact pumping ramp on the output member directs fluid from the shear space into the reservoir chamber during rotation of the input member. A temperature-responsive valve arrangement controls the flow of fluid from the reservoir chamber to the shear space. The output member has mounting pads against which fan blades are secured. The mounting pads are located axially on the output member between the lands and grooves, and the reservoir chamber and at least, in part, radially outwardly in the lands and grooves.

Abstract: A thermally responsive fluid control valve device which is particularly adapted for control of an air operable clutch. The valve device includes a housing which is adapted to be positioned adjacent a conduit which is a part of a system through which coolant fluid flows in a cooling system of an internal combustion engine. The valve device includes a thermally responsive actuator member which is adapted to be positioned within a conduit within which coolant fluid flows. The thermally responsive actuator member has a portion operable upon a movable valve element which is within the housing and which controls flow of air through the housing. The movable valve element is also operable by air at suitable pressures within the housing.

Abstract: A temperature-responsive shear drive-type fan clutch including a bourdon tube arrangement for actuating the valve plate controlling flow of shear drive fluid from the reservoir chamber to the working chamber, and external chamber means containing a suitable thermal-sensitive expanding fluid adapted to cause the bourdon tube to straighten in response to increased ambient temperature.